Sound amplifying and reproducing device for talking machines and other sound-reproducing instruments



AVMHDENCE SOUND AMPLIFYING AND REPRODUCING DEVICE FOR TALKING MACHINESAND OTHER SOUND REPRODUCING INSTRUMENTS Filed Dec. 15, 1924 PatentedJan. 5, 1926. I

UNITED s'rA'ras PATENT OFFICE;

ADOLPH MIDENCE, OF PARIS, FRANCE.

SOUND AMPLTFYING AND REPRODUCING DEVICE FOR TALKING MACHINES AND OTHERSOUND-REPRODUCING- INSTRUMENTS.

-Application filed December 15, 1924. fierial' No. 756,152.

To all whom it may concern:

Be'it known that I, AooLrH Mmnncn, of 4 Rue du Printemps, Paris, France,commission merchant, have invented Sound Amplifyin and ReproducingDevices for Talking Mac ines and Other Sound-Reproducing Instruments, ofwhich the following is a full, clear, and exact description.

This invention has for its object a sound amplifying and reproducingdevice for talking machines andother sound reproducing instruments whichis essentially character ized by the combination:

11. Of a flexible light horn or trumpet of variable length (telescopicor bellows horn for instance) the large end of which is mounted in aframe;

5. Of a reproducing diaphragm connected to the small end of said horn,the'diameter of the diaphragm being preferably, of a length equal to theheight or width of the frame at the large end of the horn;

- 0. Of extensible members (lazy. tongs for instance) pivoted, at oneend, to the frame at the large end of the horn and, at the other end, tothe reproducing diaphragm.

By varying the length of the horn and the width of its folds (in thecase of a horn with bellows), it is possible to vary the degree ofamplification of the sounds, to regulate the quality of emission of thelatter and to obtain in the'tolded or closed position, a horn occupyingan extremely reduced space.

In order that the invention may be clearly understood, a form ofconstruction oi the sound amplifying and reproducing device forming thesubject-matter of the said invention will be described hereafter, by wayof example only, with reference to the accompanying drawing in which:

Fig. 1 is a front elevation of the device.

Figs. 2 and 3 are side and plan views of this device having a bellowshorn in its open position.

Fig. 4 is a side view of the device in the closed position.

As illustrated in the accompanying drawing, thedevice in accordance withthe invention essentially comprises a horn 1, of variable length, thelarge end of which is mounted in a frame 2.

In the example shown, said horn has a square cross-section and isprovided with bellows, but it may be of any other shape or form d m y bemade of sheep skin o drum hide, lined or not, and may be con-- structedin any suitable manner.

The small end of said horn 1 fits on the central socket 3 of areproducing diaphragm 4 of any type, the circular bod of which. has adiameter equal tothe lengt or width of the frame 2. The diaphragm isprovided at two diametrically opposed points, with pivots 5, to whichare pivoted the ends'of extensible members, for instance, lazy-tongs 6,which are pivoted, at their other ends, to pivots 7 secured on brackets8 rigid with the frame 2.

From the foregoing it will be understood that the device in accordancewith the invention permits the length of the horn and the width of thefolds to be varied, so that it is possible to vary the degree ofamplification and to regulate the quality of the sounds emitted.

in the form of construction illustrated, the extensible horn isconnected at its small end to a reproducing diaphragm of specialconstruction.

This reproducer i which has been described in the United States patentapplication filed on the 15th day of December, 19%, Serial No. 756,151in the name of the applicant, is devised in such a manner that thevibrating diaphragm and the needlecarrier 9 are not exposed to shocks,in case the reproducer is shipped.

Moreover, the reproducing diaphragm is adjustable so as to permit theoptional use of a needle or of a sapphire. F or this purpose, thecircular frame 10 of the reprcducer, which projects in front of theneedle-carrier and of the vibrating diaphragm, is, as er:- plained inthe above mentioned United States patent application, provided with ahole 11 to receive one end of a suitable supporting rod (not shown) whenthe reproducer is used with a needle. The said reproducer is moreoverprovided with a hole 13 arranged at an angle to the hole .11 and adaptedto receive the same supporting rod, when there-producer is used with asapphire, and is in a position at right angles to the precedingposition.

The above described arrangements are, of course, given by way of exampleonly. The

forms, materials and dimensions of the con- The extensible horn, insteadof being provided with bellows, as described, might be for instance atelescopic horn having any cross section, square, rectangular, circular,etc. Claims:

1. A sound amplifyin and reproducing device for sound repro ucinginstruments comprising a light flexible extensible and collapsible horn,a frame secured to the large end of said horn, a reproducing diaphragmsecured to the small end of the horn, and means for causing the lengthof the horn to vary for varying the degree of amplification and thequality of sound, said means functioning to hold the horn in its variousad- 4 justed positions.

2. A sound amplifyin and reproducing device for sound re re ucinginstruments comprising a supple ight extensible horn, a frame secured tothe large end of said horn, a reproducing diaphragm connected to thesmall end of the horn, the diameter of said diaphragm beingsubstantially equal to the height or width of the frame, and meansextending along the horn for holding the same in various positions topermit varying the degree of amplification and the quality of thesounds.

3. A sound amplifying and reproducing device for sound reproducinginstruments comprising a flexible, light extensible horn, a frameconnected to the large end of said horn, a reproducing diaphragmconnected to the small end of the horn, the diameter of said diaphragmbeing, substantially the same as the height or width of the frame,extensible members extending along the horn and pivotally connected tothe base and diaphragm, said extensible members being ivotally connectedto the frame and diapliragm and functionin to hold the horn in variousadjusted positions.

4. A sound amplifyin and reproducing device for sound re rodhcinginstruments comprising a light, exible extensible horn, a frameconnected to the large end of said horn, a reproducin diaphragm ofsubstantially the same heig t or width as the frame connected to thesmall end of the horn and oppositely disposed extensible elementspivotally connecting the frame to the diaphragm.

The foregoing specification of my Sound amplifying and reproducingdevice for talking machines and other sound reproducing instrumentssigned by me this nineteenth day of September, 1924.

A. MIDENCE.

